Electric switch



C. PRADA. ELEGTRIC SWITCH. APPLICATION FILED AU.G.13. 1919.

Patented Aug. 16, 1921.

Ihvculor Chdo1?nba 5 WW ms W rm UNITED STATES PATENT OFFICE.

' CARLO PRADA, or MILAN, ITALY.

ELECTRIC SWITCH.

Application filed August 13, 1919. Serial No.

T 0 all whom it may concern:

Be it known that I, CARLo PRADA, manufacturer, a subject of the Kingdomof Italy and resident of Milan, Via Bramante 22, Italy, have inventedcertain new and useful Improvements in and Relating to ElectricSwitches, of which the following is a speci fication.

The present invention relates to an im- Figure 1 is a sectional 'view ofa bipolar switch showing the circuit broken.

Fig. 2 is a plan view of the device some of the parts being omitted.

Fig. 3 is a view similar to Fig. 1, but showing the circuit closed.

Figs. 4 and 5 represent two difierent views of the rotary member of theswitch.

Figs. 6 and 7 are two different views of a driving member of the switch.

The switch mechanism is mounted on the base l of insulating material andis protected by cover 2 provided with a central hole -3 through whichthe driving spindle projects.

The switch mechanism comprises a metallic frame bearing a rotary memberwhich consists of a quadrangular prism 5 provided with contactprojections 7- is a plate spring to snap said rotary member and fastenedon base 41'. 8 are contact spring plates fitted in front of projections6- and fastened by their lower ends 9 in recesses of base 1 by means ofbolts -11; 12 and 13 being nuts fitted on said bolts to form theterminals whereon are joined the line ends.

The switch mechanism is operated by means of a spindle 14- fitted andguided in frame -4- and provided with a spiral return spring 15- actingbetween the base of frame 4- and an enlargement Specification of LettersPatent.

Patented Aug.

lL- of said spindle. 16 is an angular bracket fitted between thepush-button -17 and enlargement 14- said bracket having its dependingarm provided with fingers 18 and .19.

The outer fingers 18- act on rotary member -5' While finger 19constantly presses against said rotary member thereby coacting withplate spring 7 to keep itregistere A pressure being exercised on button17 the rotary member revolves turn and snaps on spring 7-; 20 is a stoppin for spindle -l41.

The circuit between terminals formed through bolts 11, plates 8projections 6 and member -5.

The circuit closes at every half turn, at

eccentrically every-two pulsations of button l7.

I claim: 1

1. An electric switch, comprising a casing, contact members therein, arotary make and break device comprising a reduced body portion andenlarged end portions, a push button spindle reciprocable in the casing,and means carried by the spindle for moving said make and break deviceinto and out of contact with said contact members, said means having aportion which engages one part of said make and break device to rotateit and another portion to keep it properly registered.

2. An electric switch, comprising a casing, contact members therein, arotary make and break device, comprising a reduced body portion andenlarged end portions, a push button spindle reciprocable in the casing,and an angular bracket carried by said spindle and having fingersprojecting there from at different planes for simultaneously -engagingdifferent parts of said make and break device, the fingers of one planeserving to move the make and break device into and out of engagementwith said contact members and the other fingers serving to keep the makeand break device in proper register.

In testimony whereof I aflixed my signature, in presence of twowitnesses.

CARLO PRADA; V Witnesses: E. E. 'ERRANIANI,

DR. PASTORSIO MURANS.

